Electrostatics MCQ Questions Answers Electrical Engineering

Electrostatics MCQ Questions Answers – Electrical Engineering

1) The relative permittivity of air is

a) 0

b) 1

c) 8.854 x 10^-12

d) no one of the above

2) An electric field can deflect

a) x-rays

b) neutrons

c) a-particles

d) y-rays

3) The relative permittivity of most material lies between

a) 20 and 100

b) 10 and 20

c) 100 and 200

d) 1 and 10

4) Electric lines of force enter or leave a charged surface at an angle

a) of 90⁰

b) of 30⁰

c) of 60⁰

d) depending upon surface conditions

5) The ratio of force between two small spheres with constant charge in air and in a medium of relative of relative permittivity K is

a) K² : 1

b) 1 : K

c) 1 : K²

d) K : 1

6) For a dipole, electric field varies as

a) r-2

b) r-3

c) r-1

d) r-4

7) Out of the materials given below, which has the highest dielectric strength?

a) glass

b) mica

c) oiled paper

d) air

8) The electric potential at the surface of an atom nucleus (Z=50) of radius 9.0 x 10^-15 m is

a) 40 V

b) 8 x 10⁶ V

c) 9 V

d) 120 V

9) The relative permittivity of an insulator cannot be

a) 20

b) 33

c) 6

d) infinity

10) The dielectric used in high voltage trans formers is

a) mica

b) paraffin

c) porcelain

d) oiled paper

11) In the above question, the magnitude of point charge is

a) 2 x 10^-7 C
b) 3.2 x 10^-6 C

c) 2.9 x 10^-8 C

d) 4.2 x 10^-6 C

12) The unit of absolute permittivity is

a) farad/m

b) volt/m

c) coulomb/farad

d) coulomb/m²

13) Electron-volt is the unit of

a) charge

b) current

c) energy

d) potential

14) Unit of electric flux is

a) JC^-1

b) NC^-1m²

c) V/m

d) V

15) An a particle is accelerated through a potential difference of 10⁶ volts. Its kinetic energy will be

a) 2 MeV

b) 1 MeV

c) 4 MeV

d) 8 MeV